Difference between absolute and relative dating of rocks

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antibiotic resistance: A heritable trait in microorganisms that enables them to survive in the presence of an antibiotic.aperture: Of a camera, the adjustable opening through which light passes to reach the film.The diameter of the aperture determines the intensity of light admitted. archeology: The study of human history and prehistory through the excavation of sites and the analysis of physical remains, such as graves, tools, pottery, and other artifacts.The pupil of a human eye is a self-adjusting aperture. archetype: The original form or body plan from which a group of organisms develops.Then, even if circumstances change such that it no longer provides any survival or reproductive advantage, the behavior will still tend to be exhibited -- unless it becomes positively disadvantageous in the new environment.

Most amphibians are found in damp environments and they occur on all continents except Antarctica.antibacterial: Having the ability to kill bacteria.antibiotics: Substances that destroy or inhibit the growth of microorganisms, particularly disease-causing bacteria.ammonoid: Extinct relatives of cephalopods (squid, octopi, and chambered nautiluses), these mollusks had coiled shells and are found in the fossil record of the Cretaceous period.amniotes: The group of reptiles, birds, and mammals.

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